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software/liblitesdcard/sdcard: boot with FatFs working (hacky). 

Tested with Linux-on-LiteX-Vexriscv on Trellisboard with 10MHz clock.
This commit is contained in:
Florent Kermarrec 2020-06-22 21:33:17 +02:00
parent 5b2f9c244d
commit 847a5fcff4
1 changed files with 17 additions and 4 deletions
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21
litex/soc/software/liblitesdcard/sdcard.c
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@ -16,7 +16,7 @@
#include "fat/diskio.h"
#include "sdcard.h"
#define SDCARD_DEBUG
//#define SDCARD_DEBUG
#define SDCARD_WAIT_WORKAROUND
#ifdef CSR_SDCORE_BASE
@ -153,12 +153,22 @@ void sdclk_set_clk(unsigned int freq) {
/* command utils */
static void busy_wait_us(unsigned int us)
{
timer0_en_write(0);
timer0_reload_write(0);
timer0_load_write(CONFIG_CLOCK_FREQUENCY/1000000*us);
timer0_en_write(1);
timer0_update_value_write(1);
while(timer0_value_read()) timer0_update_value_write(1);
}
int sdcard_wait_cmd_done(void) {
unsigned int cmdevt;
while (1) {
cmdevt = sdcore_cmdevt_read();
#ifdef SDCARD_WAIT_WORKAROUND
busy_wait(5); /* FIXME */
busy_wait_us(40); /* FIXME */
#endif
#ifdef SDCARD_DEBUG
printf("cmdevt: %08x\n", cmdevt);
@ -186,7 +196,7 @@ int sdcard_wait_data_done(void) {
while (1) {
dataevt = sdcore_dataevt_read();
#ifdef SDCARD_WAIT_WORKAROUND
busy_wait(5); /* FIXME */
busy_wait_us(1); /* FIXME */
#endif
#ifdef SDCARD_DEBUG
printf("dataevt: %08x\n", dataevt);
@ -672,6 +682,7 @@ void sdcard_read(unsigned int addr, char silent)
sdcard_set_block_count(1);
sdcard_sddatareader_start();
sdcard_read_single_block(addr);
flush_cpu_dcache(); /* FIXME */
sdcard_sddatareader_wait();
if (silent == 0)
@ -734,11 +745,13 @@ DSTATUS disk_initialize(uint8_t drv) {
}
DRESULT disk_read(uint8_t drv, uint8_t *buf, uint32_t sector, uint32_t count) {
uint32_t i = 0;
while (count) {
sdcard_read(sector, 1);
sdcard_read(sector + i, 1);
memcpy((char*) buf, (char*) sdread_buf, SD_BLOCK_SIZE);
buf += SD_BLOCK_SIZE;
count--;
i++;
}
return RES_OK;
}